get rid of rendering latency by decoupling it from i/o.

i was using a single alternator to mux both i/o and drawing
in a single proc, and avoid locking. the problem is that it
causes a fight to break up every time there's any input
(steady 100Hz) or a lot of drawing requests from the
renderer (up to 60Hz.)

i added a drawproc to handle exclusively drawing requests,
 and a drawing lock for UI widgets that kidnap the display.

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